why are the crows sitting on bare high tention wires not electrocuted?

Answer 1

Your question has been answered here : http://www.fas.harvard.edu/~scdiroff/lds/ElectricityMagnetism/BirdonaWire/BirdonaWire.html

Basically: "
The important concept conveyed is that there needs to be a voltage difference across a conducting medium for current to flow through the medium. In this situation the conducting medium is a bird sitting on a high-voltage wire. The voltage on the wire is the voltage of the whole length of wire with respect to the ground"

Answer 2

Conduction! even as an animal is electrocuted this is because of the present passing by way of their body to the floor or yet another source. because the fowl is on the cord, and by no skill touching some thing else, the present can not bypass "with the help of" their body to a distinct source. If the fowl were to the contact the cord and then say yet another cord (or some thing that has contact with the floor) then the present will go with the help of its body and electrocute it. even with the actual shown truth that i do not advise it, someone ought to carry from the cord besides and by no skill be harmed. yet even as they contact 2 wires, or the cord and the different merchandise, then this is over.

Answer 3

They aren't grounded. Its the same reason sparks aren't flying out of the wire. There is power running through the wire , but not a ground. If you put a long metal pole from the ground to the wire...you'll understand "grounded"

Answer 4

there may not be enough electricity for them to feel, or because of other safetey padding on the already bare wire (if a wire was ever left completely naked it would charge rain water)

Answer 5

There's no closed path for the juice.